In these units lenses are occasionally paired up with curved mirrors for making a catadioptric system in which the lens's spherical aberration corrects the other aberration from the mirror (such as Schmidt and meniscus correctors). Irradiation could potentially cause opacification in the lens, the severity of which will increase with https://landenzh6zl.tnpwiki.com/4615184/eyes_lenses_can_be_fun_for_anyone